Research On Gas Drainage Technique In Daxing Mine Of Tiefa Coal District

The main research work of this thesis is aimed at the problems which exist in gas drainage technique in China, uses the theories of gas drainage in reality to make safely and high efficiently production. The author analysises gas drainage technique of the world, sums up the problems of gas drainage field, masters the law of gas flowing in coal and surround rock during mining and the distribution of gas concentration in full-mechanized coal mining face, discusses the methods of measure and calculation parameters which affect gas drainage system, summarizes all kinds of methods of mine gas drainage, puts forward main reasons of inefficient gas drainage and approaches that improve gas drainage efficiency. The author studies transformation of gas drainage system in N2-702 face, which lays a foundation of later gas drainage in Daxing Mine.